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String around the Cylinder (Posted on 2002-08-09) Difficulty: 3 of 5
A cylinder 90 cm high has a circumference of 24 cm. A string makes exactly 5 complete turns around the cylinder while each of its two ends touch the cylinder's top and bottom respectively.

How long is the string?

See The Solution Submitted by Happy    
Rating: 3.3636 (11 votes)

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Some Thoughts answer Comment 6 of 6 |
The required length of the string is sqrt(90^2+120^2) = 150 cm
  Posted by K Sengupta on 2007-05-04 12:22:30
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